/*
 * Copyright 1999-2021 Alibaba Group Holding Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.aliyun.odps.compiler;

import com.aliyun.odps.compiler.type.DecimalType;

public class DecimalUsageDetector extends CaseDetector {
  private boolean used = false;

  @Override
  protected Void scan(SyntaxTreeNode t, Void aVoid) {
    if (used) {
      return null;
    }

    if (t != null && TreeExt.type(t) instanceof DecimalType) {
      emit("decimal.usage", t);
      used = true;
      return null;
    }

    return super.scan(t, aVoid);
  }
}
